The presence of Worm Castings throughout the lawn is a cause for celebration! Due to Earth’s rotation and tilt, the northern hemisphere has longer days, increased solar energy, and rising air temperatures. The energy from the sun drives the activities of living things during the spring. The warmer soil allows for metabolism of the things living in the soil (insects, worms, soil bacteria, and fungi) to increase. By the time the leaves on the trees provide welcome, cooling shade ground temperatures encourage healthy decomposition rates and other soil improvement processes including the creation of castings.